its normal that when you set an osg::Group as the SceneData that when you add a 
child the viewer is notify and update the graphic, imaging that you have to 
create 1000 of objects, if you have to recreate a  a root and set it to the 
viewer each time its a pain... ,  for the detail you can lok the function 
insertCHild() of osg::Group , you will see that there is a a call to a callback 
to traverse the new scene updated.  If you want to keep something not Display , 
its simple  just keep it in a Node , group that is not linked to the SceneData, 
and when you want to use it define it as your SceneData . THe problem you get 
with the manipulator is pretty odd , can you give more detail ?


Cheers,
Thomas

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http://forum.openscenegraph.org/viewtopic.php?p=28802#28802





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